The bold declaration in this verse is a direct result of God's promise in the previous verse: "I will never leave you nor forsake you." Commentators explain that our courage isn't self-generated; it's a logical conclusion based on God's unwavering commitment. As Matthew Henry notes, the original Greek of God's promise is emphatic, using multiple negatives to stress its certainty. Because God is our guaranteed helper, we can confidently face any human threat.